Just had the error message pop up. At first I ignored it thinking its gonna go away as the phone was no where near water. After Tring to charge it and have a alarm like sounds everytime I plugged in the charger... Ut was worrying!
Tried a simple fix and it worked ( luckily got it sorted within 30 mins of the error pop up). Turn the phone off, plug in the USB to see if the error is still there? If so following the instructions below
1) stick the USB close to the port without plugging it.
2) press the volume down and power button and then plus in the USB as soon as you see the phone boot up.
3) it will boot up as normal but do not unplug until the phone is at 100% just in case!
If it still doesn't work, restart the phone. When it has booted do not enter password to complete reboot.....follow step 3 so press the volume down, power button and plug in the USB all at the same time. (I know its tricky to do but it's possible)
Hope it works for you guys too?